4" Dust collector to 2 1/8" Shop Vac hose reducer.
thingiverse
One end fits snugly inside a 4-inch dust collection hose while the other side accommodates a shop vac hose with ease. The dimensions are precise enough to eliminate the need for a clamp, though I did add a ridge around the large end just in case. My measurements were taken using metric units, which might result in minor variations from the exact 4 inches and 2 1/8 inches.
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